Centering-tool.



S. SANER. GENTERING TOOL. APPLIOATION FILED JULY 10, 1906.

91 8 ,378. Patented Apr. 13, 1909 1:: IQRRI: nuns cm. wun'moror, p. c.

STEFAN SANER, OF BELLINZONA, SWITZERLAND.

CENTERING-TOOL.

Specification of Letters Patent.

Patented April 18, 1909.

Application filed July 10, 1906. Serial No. 325,556.

To all whom it may concern:

Be it known that I, STEFAN SANER, draftsman, a subject of the Republicof Switzerdrawing). as to form guides for the slider O; in which land,and resident of Bellinzona, Switzerland, have invented new and usefulImprovements in Centering-Tools, of which the following is aspecification.

The object of the present invention is a device by means of which thecenters of axle bearings of locomotive engine axle boxes can be found.

A constructional form of this invention is shownin the annexed drawing.

Figure 1 is a longitudinal section. Fig. 2 shows the device in use.Figs. 3 and 4 are a plan and a side view of the slider and its sup port.

A is a screw spindle with a left hand thread having an extension in theform of a jaw with surfaces L, L and L at one end, and at the other endan extension D of square section.

B is a screw spindle with a right hand thread having the same pitch asthe thread of the screw spindle A, the said screw spindle B hasvsimilarly anextension in the form of a jaw with the surfaces K, K K andhas a square hole D running through its length, into which fits theextension D of the spindle A. Both spindles are screwed in a sleeve O,which has left and right hand threads corresponding to the threads ofthe spindles.

A. box E is fitted on the sleeve O which is movably guided on the saidsleeve O by means of a screw thread. Another box E is also guided on thesleeve O in the same manner as the box E. On the cylindrical part P ofthe box E is a support G which is held from moving by means of a setscrew M on which said support G is a scale (notshown in The support G isof such a shape guides the slider O may be moved by means of a screw Y.On the slider O are described a number of circles, the center thereofbeing marked on the slider. The support G is seated between the twoparts E and E in such a manner that it may even be moved when the box Eis tightly clamped. This is possible owing to the fact that the part ofthe ox Eon which the support G is seated is made a little wider than thewidth of the support, so that when the box E is screwed up against thebox E a clearance space is left between E and G, so that the latter canbe moved when the screw M is loosened.

At both ends of the sleeve O, are rough handles R, which may be easilyturned by hand. For the same reason the box E and the counter sleeve Ehave rough edged collars.

The support G seated on the box E, with the slider O can be adjusted bymoving the box E and fixed by the box E, so that the center of thecircles described on. the slider is exactly in the center between thesurfaces L, K, and L K, which is the case when a mark on the sleeve 0coincides with a similar mark on the box E. On the support G is a scaleso that when adjusting the slider on zero thereof, the center of thecircle to be described, lies in the plane of the two surfaces L K andthe apparatus is in a plane perpendicular to the sides of the axle-box.

The apparatus is used .in the following manner :After the bush of anaxle box has been cast, and the axle box has been inserted, it isnecessary to describe a circle to indicate the part of the bush which isto be bored out. To ascertain the center of this circle, the apparatusis clamped between the two sides of the axle box as shown in Fig. 2, sothat the end of the surfaces L and K rest against the surfaces F of thebush. If it now be the case that the support G is parallel to the sidesof the axle-box, the support is adjusted at zero, the mark in the sleeveO is opposite the mark on the box E and which is now generally the case,the surfaces F lie in the horizontal central plane of the bush, then thecircle center of the support lies in the central axis of the bush sothat the circle can now be described from this point.

By means of one apparatus, many axle bush can conveniently and in ashort time be sketched out, which compared with the hitherto knownmethod, in which a special piece of wood had to be prepared, saves timeand material. The apparatus can also be used as controlling apparatuswhen boring out the bush.

It may now be assumed, that the axle bearings, i. e. of a locomotivehave been bored out. Then the apparatus is clamped into every axle box,as above described when the slider is moved about in such a manner, thatits center corresponds to tlie central axis of the accurate boring. Ifthe bearing is accurately bored around the described circle, then it isnot necessary to move the slider. All the axle boxes of the locomotiveare then set in, and the distances of the various axle centers areverified by means of calibers,

when measurements are taken from one slider center to the other. If nowin consequence of the inaccurate boring of a bush, the central distancedoes not correspond with that of the caliber, the difference can then bedirectly read from the slider. This difference shows how much one sideof the axle box should be packed up or ground off so that there is thecorrect distance between the axle centers.

Having fully described my invention, what I claim, and desire to secureby Letters Patent is:

A centering tool, comprising in combination, a sleeve having at the twoends respectively a left hand and a right hand internal thread, a lefthand screw spindle having an extension of square section and a jaw, saidspindle fitting in the left hand thread of said sleeve, a right handscrew spindle having a jaw and a square hole into which fits said squareextension, said spindle fitting in the right hand thread of the saidsleeve, a box and a nut screwed on said sleeve, a support j ournaled onthe box, a slider sliding on said support, and a screw for adjusting theslider, substantially as described and shown and for the purpose setforth.

In testimony whereof I have hereunto set my hand, in the presence of twosubscribing Witnesses.

STEFAN SANER.

Witnesses A. LIEBERKNECHT, Josnrn SIMON.

